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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf1b784e323bf14012c32d0e4c8b22ebc53cf0ba2f3746e011ed476b1de9cae7' 
  AND token = '4IZKRY4X0N3TEkxgXCi2mobH2qbKAm1Ujh3FgmSVYDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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