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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be48ff4761a5d619ebbfce9cd33289d4db1520f21bdf3ad993c694d6e49a62a0' 
  AND token = 'jh6eO9anP0IG/AoaTbLmfEnfUtleqTx774//1lBEabk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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