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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29092931f39756e2bef8ec2488e6792b3cbe9bd3d8ee6ccd17689b6bfaf9307e' 
  AND token = 'ylt4o96czP3BM2n9nPA4M0vs8E0zSmOu24Jop36Zjvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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