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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bb1fbb3cefefb755f9bc1d5a1baa830fb9c6a051db6a4176c9bb91ff94d837' 
  AND token = 'WUSp8K6+iCkOc+RT1V80crn3Zvn2/G/pt9ZS5ueArSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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