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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12fce7a2029ee14be8aeba051724c5543c1ba3a9d7711536ef8c4c37d12e045' 
  AND token = '0JSJxLqHyB61Mm5gdbU+dcsARKzUJHuN2FOPzSqQLlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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