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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab90becb0b6b7fac17423527ccf8caaf284eace3836a42cb91bd9a64698b8e73' 
  AND token = 'J7scOpB8A9IPjLZmOiDcxXL+OrJfBGhuUkeP2jiH06Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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