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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a911ca7381e9b4ffdaa3f10caeb357e6929d5a1899f00fe1ad12eb684ed0c31' 
  AND token = 'AGf2AWNYaRZc0tpDOCr6grHAAcNOJrSBBt6hEHlOtkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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