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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '540691da64053346fb91eae1b9f40b401bed6fbf6c676667e54802a1728d97c1' 
  AND token = 'V1qcZRAetg7Kh1OttGRy419328gqdIicZKCSuiV3vxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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