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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf6ab632ff03524ddb5fe9ab0e73ed40bcba33fa92e218ff8732c81988c9991d' 
  AND token = 'cGlu46WN8Yw04iNv9qVMKp7Qb0vhFEKSfTIXDq5aQ6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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