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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fb3d61c8271e15e2e69a9bb204c7ef74dcac7a93e29f1a807698eb2accadc9' 
  AND token = 'G97eyJ1otxnye1ydTa6tfP5fIqfFR3tGIdDJdpdxHGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}