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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549d472a206761aa41457a231e7a02570b55982af531ed5661a4030d02cf678e' 
  AND token = '7g2eOCkyqpplhxXTgs8DwUQg/Fjl8nA0Fcuqws/5E3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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