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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e62cd3a55771616f618bfd7508ce44bf6f466b75569ec9ab51eac324f3846a7' 
  AND token = 'S6rRnlG4IVYjhj6k4q8J/9uETcVp0B0TVu4RGrLm9RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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