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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed0ac78e8a7018feb5673dc91ff19df0b6e8185fce671b94762c84d460490e80' 
  AND token = 'x39dnVLGajFF3w2T3vo5ZT0qMskenrro8UYvoypryfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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