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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '380a0c7931cabff830a89bcc1bae10bcebb53ff5953ef8115b3ad525a79910a6' 
  AND token = 'BomEMkt136vuf1hT0odHrDTa2suglql/e+QwG+dqYSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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