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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adaee98e1f274e92056a5a1c124b011e9765f2d23798769346e37ce7a9f4d0ae' 
  AND token = 'nngk1tXYH07cq10ELv2ij2YacltOTXRImZtPCU11E7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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