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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b39fc72844fe9b83434de681c93d1afc9bf7e49807f9236f84d308819149c1' 
  AND token = '1Xt30jHNRj2MKk4JC+n4PFg1qJ27snHt9LDfP6JG4KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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