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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1ce839918cd42c2b61610455fdde711d25da75f0304e12880d543a51035814' 
  AND token = 'tqFcRHvcDZvBsjrRtkF3lqj4VSfRJGL76T0KGe2vB88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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