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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba30e0233400f0aaeebab84e851e92d5d4ed5af9d222576c0029b07d9c8de30' 
  AND token = 'dMc/BBmW7jjbhAE3lflXB2VnmFmCBsG5yO4uMGxBJ/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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