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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e609ead36f962877c6b91f30da7a1c4427a5fcfdc885a49b982564c8645e887' 
  AND token = 'ymN6ooieR8CzjVjtPO8s0p6eIWIHm5fLJcV13U0QqKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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