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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ffe9e479f55901d01b744e7c1b6582a84b8c6ec11c0b477936e6d335c63eac3' 
  AND token = 'qgKMq5fASb+ZekPe00Bu/btUXpTnaA3QqgvKHqTyDeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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