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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ca2c934b9f84a37ccdb4cc514707ebbf70ecd8695d9f122929869f3b8f8d81' 
  AND token = 'dcGuKVDwtZy4/7wGLrWIARhPI1CU33ML73kDTcZcz3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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