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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af4560465f04b20dd1dd68017a2f4ed8d0395e14f2406d6f91833e8d93c411c' 
  AND token = 'gMuf57TMDAkkG08uTYAfQ6HOV8fDluC3jQP3kGB5YcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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