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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d32ebae9616ac8f68961619f23488d6f9a549e45e3b76df65c6a1e82be04f55' 
  AND token = 'YJfe9vRTDRm/BY4ZOTdxI76rtN5Jx5OjGRWBGAG1OrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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