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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700f67905ac5f2e1a04914b96c378b3377d60e86d34a964aa7efc8a7ed994cc5' 
  AND token = 'oyHeTq6G23GACoK/RO2V6dgs29TpMCZDZW2R/TydzSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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