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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c5f81d1258d1d66097134403a0e43e179327ecc36acb8b26bf71bd247e7c6d' 
  AND token = '1oH2uaO2jaBwtWgygc9iXVImLWmuVVD6B39A+SuwL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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