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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a657fddea66377fd6c7365ec98ec8f4af274980a1360f5936a5126cb23559d6c' 
  AND token = 'FA6KfARmvQ8I0CJKpJk6UIQzRTkvtqFPw88crj1/7lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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