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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7fd5eecb087babb548296abf4dcf4e295fe1fe7fe0ea934c198e568a3910fe' 
  AND token = 'YGg5OGvGB5c+5deI57eoETkCC4PFMiwcs02zmUnqAGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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