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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f935abb0c00f1ceed160fe65deaf746b1b886e436609f7b7a1909713c2968d' 
  AND token = 'MpwaqPsV2RTeAVqy9Rb/64UWWB/4i2+pioSRBBozBVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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