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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6345882d2d17c01a22b8b068e89e4856fa8489925a4326407e014f5e80d57ed3' 
  AND token = 'J2f6ChecjOIypWabTdlLU/OrSUfCWiHxxXajK29els4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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