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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955178128c0d53ad1ac45d65ae177f761b8150199c73a547ac53aa95c16a68e1' 
  AND token = 'Jvltqd5+EcoYPs0zem4W9VFRwAC3UQAnpKZWWFH2WIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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