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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc57965e5fdc6697582d9a6b6dc91dfc12140ec71e09be11cca4773e84e10460' 
  AND token = 'gY4P+rCvqJ/v2058jqGDzS+1SRpymufFjR2OI3/Gmi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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