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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '249220ae46ff10c9db1e6b9d0fc1198d1066623afe2601b2c5690e5b436e8a88' 
  AND token = 'bHXSTpRN0Ev6dcJ3B5os8twyDUcsLgXX4gI7YjNoEfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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