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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33034ab130d335007bd90e568d85b569fd2e3ed8042ecb734126be46dc7c546e' 
  AND token = 'w6zOARMGzgwAAZ1gqTOu1iqxbFEgoPINB+Ka+y/UuAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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