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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '166a8c48a973c9c8721fe876d0b18c2938b9fcddf6121e8aa64f2a0ba34504f6' 
  AND token = 'aZqyEvA4ZO9pKXv566yvB70op9vz2bvomyF5B15nz/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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