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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522689fbc3c13c5bf7bebcb38310257312211192f5e1f3619988c4bd9b552cb8' 
  AND token = 'W6FsRQszQTucqjC/RtRAySFncAW9TF+lk5oOFlkmvks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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