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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f894c96f71c6e948c9dddff5324a7f41e0de85a8e11f67404a6280910e8c8c1' 
  AND token = 'o/MWFqzfYQYxNelzbR6w+KZSAiMYAEI2OlX6FiQkE88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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