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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac25c74c825ffb3ee655e388ed199108ebb0e36c50e8592363dd5d3ec95abed5' 
  AND token = '5aUgkS9G7XC2NQabRecgQbHN3ob4K6L4hNKUwCUqgJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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