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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5631af85b8001001fb4778ef3b25eadf9a7d4176c2369f8f1c613d5a0daecbaa' 
  AND token = '9+ap767y/RTnAgRcO/Zl5ErkGnWn5Um50Km0XxbyIFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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