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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95bece598c16f4e3e5d6bdcd949dae274b84d6117a51d29da08df3b52de4c39' 
  AND token = '0GOAGHlWBO9jT/AB6NMQUXNDCOIROtAfafrwseGdOeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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