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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fff014831071c6e083698b1c712370702a1e7721438108368a2047e81f67f66' 
  AND token = 'hgn76esWV/iDNmFAXrLO1/gjB+ruOITNwwX19w2vEiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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