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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b869d87581916125445d6be6f9305729b84f07ee2f34c9bc7f8d5bb2e83787e' 
  AND token = 'kQu77tKklwxrDtyqm6VCJZIq//gutXx59rVCwusfa24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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