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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2a87fc42fd0aa54dbbe1f2d8f8fe99f1f3ee4466b3795d42beabc39138412f' 
  AND token = 'L0Hoi9CQEGuYb2pHteRkgtFLoz9BkKQ7LS5cvYBCSHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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