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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2264cb7a239b77fa78f9c9330f44d14283e6f24208b97679daf4884f0f075bbd' 
  AND token = '4zafvcBkQVsXLB7Ch/s0Q2ZcJQNJLY7cALVUaPoi7L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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