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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7cccc93f7c342a2efdd88a1481ad1d2259ccebd1ab6fce3bd808738e4d9a7e' 
  AND token = 'tjZf1zy/vbeZn9+Bs6KdWo6l5+KAI7Cx1wLtCj8USs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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