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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd119a5e37b235a213fb6d80b1808d095941c0af58ab4c1c7d68adf6e4fbcc49f' 
  AND token = 'PDbz+a6cwwdP6JWDM0tXubTGSt8bwXtDPufiFT7xYTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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