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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0686b96f52fa4b0c5e63cd29c8a1087aa66a244f9b2c8e3b1e8d69dcfec6e46d' 
  AND token = 'VYna67mpJklSyzvHfOj2R9gE8Vi7xRtVEAc+mHEw0tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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