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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d543eb0b5806b2d680de6b085e84bcce0e2831b89020284d670b6d0a3f2051' 
  AND token = 'aoEmh03ATIGbGgtpXjOfz6se0KZnJvLzg8g31Ijxfhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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