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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2571cbdc61d312ec385fc275407b244525e9216d44cd7226375b5e4122c2de' 
  AND token = 'JGFRyaSoMj3ceWj9vXLht5fjN12fadvsznGAOr48hq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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