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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1e11d943f942b1a8b982c107860fbf9de9799f3f2ac979211befacee3cb030' 
  AND token = '4A1Jqu+LpmdsOUhXrVtAsfV7/o/9BOGPk9PtPi/n1Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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