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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea4216ec585f880d01d3effdbb7d65882ade708e39b2c759e911c337387b2a3' 
  AND token = 'yMZIVfYD4dHvmTLqjhK7f9CnJoJ30O/5B1y8Z9Hst3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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