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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f70191dcd4ccd5c66bb2467670e53edd3876e088c43e7fdd3f90a33c9915ba' 
  AND token = 'dDY5e9sOF7seuhB/OEfhalPLWhmWOqvW4SZ3SmPgoF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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