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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52403eaf680bd075c4bd0bb31ec4e88b4eb86ab5f143fdeb3ee7786ad4043bd9' 
  AND token = 'rIG88+/Vr4Y6UUM0EJNUruOtNlrhIQf4xeZaSn39jL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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