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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11ca292e9b085aad7fc1ef620c185c9c05353d6dc5e5eb81c72eb7e72bb29ed4' 
  AND token = 'h855THhYNEMhKOrqrsnV+dekopiM6t5ajJ/Ns2aEpJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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