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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cd500782faf873287f03e471c87547620d3e68bf71e3623e1c33b47af30b87' 
  AND token = 'gdObP7azaB6a517kGoyq6Hg3i4JCEYZ75tBnIlFDkuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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