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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc27d46b07f4db8b2ddb9b80bb2c9b4d29f651fbd1b68d8b3d66d2883c279522' 
  AND token = '0J5kAA1Nz83lQsjgd3V73xk2VA2CT30eeFYEo1Pc3LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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