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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3ca15af7b2edcda51ab3bc34deb434fdd123728cc806bd88fbc469c3bd7123' 
  AND token = 'AFOUdyVSNnnvyg+751VoORSXxDg0SDRMgSMQ8ImhQik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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