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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a831075e0f1e81ad2d983e7d8e521e0b49ba698a6326a1595d763d271270afd' 
  AND token = '9jH2F44nWUjFctWpkbIKUrXGVMrpkKqM6mhwE6aHIUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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