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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa4fe99bc0d697e7775f87e0f7a5923afa6915ab3aaa3918f8ee4b24f04cdaa' 
  AND token = '+ec1wV5vnQFuCgLuB/nXP8uJuqB9K/yf51eS0M3juWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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