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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e07f8e91383135620aaef83352fdd43bef15d374ea20000c67969e6acc3de8' 
  AND token = 'jb34lRXZoyJDIZpAooxv3+a9w0BlxXjx+BRoO2se7Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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