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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafb6bab97b3548dad5ef65d4c1a2827091389929872efcadb764ecb35173249' 
  AND token = 'qXDCLEI9DpE1e6Ss0dNTCFoZ8ShNSb9GzPAL2KrNBbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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