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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e9aa64b7d10dd006e1d3b0982d82b563ba68bf205f4260c7237d83059a3990b' 
  AND token = '9mmva5RMiRhUk5bYB6j6DX3QfnbxfIzUWWKcY+8Smkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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