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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0d75e606a0c50e0a24afa23f46f1228b0733e69a2e5f55b7cc1ddb70d83e7e6' 
  AND token = 'BeZAuqE+Rd+9sDjx6vi+nSVGhhvhOZGyrTeE9z9TMzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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